Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/117890
Title: Effect of Eu doping and partial oxygen isotope substitution on magnetic phase transitions in (Pr1 - Y Eu y )0.7Ca 0.3CoO3 cobaltites
Authors: Babushkina, N. A.
Taldenkov, A. N.
Streltsov, S. V.
Kalinov, A. V.
Kuzmova, T. G.
Kamenev, A. A.
Kaul, A. R.
Khomskii, D. I.
Kugel, K. I.
Issue Date: 2014
Publisher: Maik Nauka-Interperiodica Publishing
Citation: Effect of Eu doping and partial oxygen isotope substitution on magnetic phase transitions in (Pr1 - Y Eu y )0.7Ca 0.3CoO3 cobaltites / N. A. Babushkina, A. N. Taldenkov, S. V. Streltsov et al. // Journal of Experimental and Theoretical Physics. — 2014. — Vol. 118. — Iss. 2. — P. 266-278.
Abstract: We study experimentally and theoretically the effect of Eu doping and partial oxygen isotope substitution on the transport and magnetic characteristics and spin-state transitions in (Pr1 - y Eu y )0.7Ca0.3CoO3 cobaltites. The Eu doping level y is chosen in the range of the phase diagram near the crossover between the ferromagnetic and spin-state transitions (0.10 < y < 0.20). We prepared a series of samples with different degrees of enrichment by the heavy oxygen isotope 18O, namely, with 90, 67, 43, 17, and 0% of 18O. Based on the measurements of the ac magnetic susceptibility χ(T) and electrical resistivity ρ(T), we analyze the evolution of the sample properties with a change of the Eu and 18O content. It is demonstrated that the effect of increasing the 18O content on the system is similar to that of increasing the Eu content. The band structure calculations of the energy gap between t 2g and e g bands including the renormalization of this gap due to the electron-phonon interaction reveals the physical mechanisms underlying this similarity. © 2014 Pleiades Publishing, Inc.
Keywords: CALCIUM
COBALT COMPOUNDS
ELECTRIC PROPERTIES
ISOTOPES
AC MAGNETIC SUSCEPTIBILITY
BAND STRUCTURE CALCULATION
MAGNETIC CHARACTERISTIC
MAGNETIC PHASE TRANSITIONS
MEASUREMENTS OF
PHYSICAL MECHANISM
RENORMALIZATION
SPIN STATE TRANSITION
OXYGEN
URI: http://hdl.handle.net/10995/117890
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84897517874
ISSN: 10637761
DOI: 10.1134/S1063776114010026
metadata.dc.description.sponsorship: DFG GR 1484/2 1, FOR 1346; Russian Foundation for Basic Research, РФФИ: 10 02 00598 a, 11 02 00708, 11 02 91335 NNIO a, 13 02 00374; Ministry of Education and Science of the Russian Federation, Minobrnauka: MK 34432013.2
This work is supported by the Russian Foundation for Basic Research (projects 10 02 00598 a, 11 02 00708 a, 11 02 91335 NNIO a, and 13 02 00374), by the Ministry of Education and Science of Russia (grant MK 34432013.2), by the Ural Branch of Rus sian Academy of Sciences through the young scientist program, by the German projects DFG GR 1484/2 1 and FOR 1346, by Köln University via German Excel lence Initiative, and by the European network SOPRANO.
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